3D-Proto CoreXY Bowden Extruder - precision piezo z-probe

3D-Proto CoreXY conversion from direct to bowden extruder
for precision piezo z-probe (screw-mount) with optional multimaterial Y-joiner.

Using the things:
+ "The Filler" https://www.thingiverse.com/thing:3020026
+ Voron Extruder modified https://www.thingiverse.com/thing:3191081
+ precision piezo screwmount version https://www.thingiverse.com/thing:2319993
+ optional : my remix of the y-joiner, see the original thing for a gcode generator https://www.thingiverse.com/thing:3039887

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